There is no hard and fast rule- it's a creative thing so do whatever gives you the look you want!
Amber
On Earlene's website she has a cake serving chart and it says what size cakes to use if you are doing tiers. I know you don't have to use it but I like it. Here is the link:
http://earlenescakes.com/ckserchart.htm
i always use the same difference all the way up.. if the bottom two are 2 inches in difference then so should the rest of the layers (be 2 inches in difference). just more consistent look. However, with that said... stack your pans, eyeball it and see what looks best!
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